Animal-shears.



PATBNTED DEC. 29, 1903..

` W. M. GAHILL.

ANIMAL SHEARS. v APPLIOATION FILED JAN. 26.1903..

N0 MODEL.

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UNITED STATES Patented December 29, 193.

WALTER MYRON CAHILL, OF WINONA, MINNESOTA.

ANIMAL-SHEARS.

SPECIFICATION forming part of Letters Patent No. 748,478,1dated December29, 1903.

Application filed January 26, 1903. Serial No. 140,542. (No model.) l

.T0 all whom it may concern:

Be it known that I, WALTER MYRON CA- HILL, a citizen of the UnitedStates, and a resident of Winona, in the county of Winona and State ofMinnesota, have invented-a new and Improved Animal-Shears, of which thefollowing is a full, clear, and exact description. l

This invention relates to improvements in animal-shears of that classknown as clippers, which are more particularly usedfor shearing sheep,although the improvements may be used generally in animal-shears.

The object of this invention is to provide an improved instrumentwherein the friction of the working parts is minimized.

Afurther object is to simplify the construction of the shears by theelimination of certain friction parts which are presentin some priorkinds of shears, and to thereby promote the efficiency of the instrumentand decrease the cost of manufacture.

Further objects and advantages of the invention will appear in thecourse of the subjoined description and the novelty will be defined vbythe annexed claims.

Reference is to be had to the accompanying i drawings, forminga part ofthis specification,

in which similar characters of reference indicate corresponding parts inall the figures.

Figure 1 is a vertical longitudinal section through an animal-shearsembodying my invention, the plane of the section being indicated by thedotted line 1 1 of Fig. 2. Fig. 2 is a horizontal sectional plan viewtaken in the plane indicated by the dotted line 2 2 of Fig. 1, and Fig.3 is a vertical transverse section in the plane ofthe dotted line 3 3 ofFig. 1. 5 designates the body of the implement, having arearwardly-projecting extension 6 and a flat plate 7, the latter beingmade in one piece with the body and extending beyond the front edgethereof. The body 5 is provided with an internal chamber 8, adapted tocontain a part of the actuator 9 and the means for driving the same, aswill presently appear. The forwardly extending plate 7 constitutes acontinuation of the bottom of the chambered body, and in the free edgeof this plate is an undercut recess 10, which receives the heel of thecomb-plate 11, the latter being provided with the forwardly-exd tendingteeth 12, said comb-plate being fastened rigidly and detachably to therecessed under side of the plate 7 by screws 13 or their equivalents. Inthe tubular extension 6 of the body is arranged a longitudinalbearingsleeve 14, held in place by a screw 15. One end of this sleeve isprolonged or extended beyond the tubular body extension 6 in order thatit may receive a member 16 of a flexible coupling,the other member ofwhich coupling is indicated at 17 and has pivotal connection with themember 16, said members being4 similar to couplings which are ordinaryin this art. In the coupling member 17 is carried a shaft 18, adapted tobe driven from any suitable source of power, and this shaft is providedwith a bevel-gear 19 of peculiar pattern, the same adapted to alwayshave intermeshing engagement with another bevel gear 20. This bevel-gear2O is secured firmly to an end portion of a vibrator-shaft 21, whichextends longitudinally through the bearing-'sleeve 14 and is heldagainst endwise movement in one direction by means of the collar 22.Said shaft 2l has its opposite end portion extended into the chamber 8ofthe body, and on this end of the shaft is fixed a crank disk or head23, the same being provided with a crank-pin 24..` (See Fig. 1.)

An essential feature of the present invention consists in the vibrator9and the means for mounting the same Within the body 5. This vibrator ismade in the form of a onepiece fork, having an elongated shank 9a. Theheel or rear end of this vibrator-shank is provided with la curvedrecess 25, constituting a socket, which loosely receives a ballshapedslide 26, said slide being approximately circular in shape, as shown byFigs. l and 2, to minimize the friction and provided with au axialopening. The globular slide 26 is tted loosely on the crank-pin 24, soas to partake of the rotary motion thereof, in a path eccentric totheaxis of the shaft 21, and this globular slide communicates the motion ofthe shaft to the vibrator 9 in a Way to make it traverse the comb-platel1.

The vibrator is provided on its under side and at a pointjust in advanceof the socket 25 with an inclined socket 27. (See Fig. 1.) The inclinedsocket is closed at its upper end, While'its lower end opens through theunder face of ythe vibrator. 28 is formed in the bottom of the chamber 8at a point directly below a vertical screw 35, to be described, saidstep-bearing opening through the upper face of the bottom and beingdisposed in opposing relation to the socket 27 of the vibrator. Thesocket 27 and the step-bearing 28 accommodate the end portions of arocker-spindle 29, which is disposed in an inclined position across thelongitudinal axis of the implement. This rockerspindle is provided atits ends with enlarged rounded heads, one of which fits snugly in thesocket 27 of the Vibrator, while the other occupies the step-bearing 28.This rocker spindle maintains the heel of the vibrator 9 in an elevatedrelation tothe bottom portion of the chambered body, and it will benoted that the vibrator is held free from frictional engagement with thechambered body 5, the only parts of bearing being those afforded by therounded ends of the rocker-spindle. The area of frictional surface isminimized by interposing the rocker spindle between the body and thevibrator, because the rounded ends of the spindle'aford the points ofsuspension or support for the vibrator within the chambered body.

By reference to Figs. 1 and 2 it will be seen that the rear portion ofthe vibrator-shank is housed within the body; but the enlarged orfork-shaped end portion 9b of this vibrator extends beyond the chamberedbody 5 and its plate 7. This exposed fork-shaped end of the vibratorcarries the cutter thatis adapted to traverse the upper face of thecomb-plate 11 and its teeth 12. This cutter is a steel plate 30,provided with a series of forwardlyprojecting blades 31, three innumber, as

shown by Fig. 2, although the particular number is not material. Thecutter-plate is disposed in underlapping relation to the forked end 9bof the vibrator, and these parts are secured rmly together by screws 32.The cutter-plate is thus attached directly to the vibrator, so as tomove therewith and traverse the teeth 12 and the spaces therebetween ofthe comb-plate 11; but the cutterplate may be readily detached byremoving the screws 32, thus making provision for easily resharpeningthe cutter-plate by grinding the same or in any other preferred way. Theemployment of the rocker-spindle 29 is of decided advantage, because itenables the vibrator to accommodate itself to any position which thecutter-plate may assume with relation to the com b-plate, suchirregularity in the position of the cutter-plate being due in some casesto the irregular grinding of the under surface of the cutter-plate.

The fulcrum of the vibrator is afforded by a screw 33which alsofurnishes the means whereby the frictional engagement betweenthe'cutter-plate and the comb-plate is regulated. Said vibrator 9 isprovided in its upper side and at a point intermediate of its lengthwith a socket 34, the walls of which A step-bearing are smooth andadapted to receive the ballshaped .lower end 35'of the. screw 33, whichball-shaped end of the screw minimizes the frictional engagement of thescrew with the vibrator and allows the latter to move freely,particularly when using a worn cutter or a new cutter. The screw hasthreaded engagement with a female threaded tubular bearing 36, which ispreferably made in one piece with a removable top plate 37, the latterbeing fitted over an open side of the chambered body 5, so as to closethe Achamber 8 therein. Said removable plate is providedv with dependingears 38, which overlap the sides of the body and which also support thefasteningscrews 39, the latter being adapted to screw into threadedopenings 40, which are providedin the side walls of the body 5. (SeeFig. 2.) The upper end of the screw 33 is furnished with a notched head4l, with which is adapted to engage a spring locking-post 42, the samehaving an angular foot 43, which rests on the removable plate 37 and isfastened detachably thereto by the screws 44.

The end of the spindle 29 engages the body bottom at a point in linewith the vertical axis of the screw 33, which enables me to secureuniform tension on the vibrator and cutter.

It is evident that the post 42 maybe pressed by hand from engagementwith the notched head 4l and that the screw 33 may be turned in adownward direction for the purpose of depressing the vibrator 9 andforcing the cutter into the desired frictional engagement with thecomb-plate and the teeth thereof, after which the spring-post isreleased to have interlocking engagement with the notched head andprevent the adjusting-screw from turning accidentally in its bearingafforded by the sleeve 36. It will be observed that the rocker-spindle29 engages with the under side of the vibrator, while the fulcrum andadjusting screw 33 .has socketed engagement with the upper side of saidvibrator. When the shaft 21 is in motion, the crank-pin 24 and the head26 operate on the heel of the vibrator to move it transversely withinthe chambered body, and this vibrator turns on the axis afforded by thesmooth lower end 35 of the fulcrum and adjusting screw 33, thus givingthe traversing motion to the forked end of the vibrator and the cutterattached thereto. During this traversing movement of the vibrator therocker-spindle 29 is free to turn in the bearings provided for itsreception in the vibrator and the bottom of the chambered body, saidrocker-spindle conformingl easily and readily to the changing positionsof saidvibrator and also accommodating itself to the transverseadjustment of the vibrator obtained by the rotation of the screw 33.

Having thus described my invention, I claim as new and desire to securebyLetters Patent- 1. An animal-shears having a body pro- IOO IIO

vided with a step-bearing in the inner face of its bottom, a comb-plate,a vibrator -provided in its upper side with a socket in verticalalinement with the step-bearingA of the body and in its lower side withan inclined socket, an inclined rocker-spindle engaging the step-bearingof the body and the inclined socket of said vibrator, and an adjustingand fulcrum screw mounted in the body and itted in the socket in theupper side of the vibrator.

2. An animal-shears having a body, a combplate, a vibrator provided witha cutter and having a socket in its upper side, a fulcrumscrewsnpportedby the body and engaging the socket of the vibrator to adjustthe latter and serve as the fulcruln or pivot for said vibrator, arockerspindle having its end portions seated in the body and thevibrator and disposed in an inclined position relative to the screw withits forward end in alinement with the said screw, and means to impart atraversing motion to the vibrator.

. 3. Animal-shears,con1prisingabodyhaving a step-bearing in the innerface of its bottom and provided with a removable cap-plate, saidcap-plate being provided with an internallythreaded ltubular bearingprojecting from its upper face, a comb-plate on the body, afulcrurn-screw -in said bearing, a vibrator having a socket in its upperface in vertical alinement with the step-bearing of the bodyl

